Hi, When my children were born my husband and I wanted to honour the Irish side of their heritage (my mother is from Ireland). We did this by choosing Irish middle names. My daughter's mn was the literal/actual word for 'heaven' in Irish, which is Neamh (pro. n-EE-v). I see that this is not in your database. You do have Niamh, which is a slightly different spelling used to reflect it's use as a name.
Neamh can be seen below, as the Irish word for 'heaven' in the Irish version of the Lord's Prayer: